Disaster What and who caused the disaster?

Disaster What and who caused the disaster? Why did it happen? What was the result of this disaster?

Disaster 1

The dead of the lines of AT&T

Was the mistake of one line a code of one actualization.

A switch of all the base of AT&T shut down for 9 hours it send a message to all the nodo to stop working . 75 million of phone calls were affectted; 200.000 missed flogth reservations

Disaster 2

The exorbitant Mars Climate (1998 )

the software was controlling the ship, used imperial units (pounds force) rather than metric units

(newtons) Well the spaceship was going to be in the same orbit at mars but motors star whit a lot of power that smash the ship against mars The lost of 125 millions of dollars

Disaster 3

Mariner 1 (1962) A programmer incorrecty coded into the software a handwritten formula.

The rokect was launched with the destination of Venus, but this change the course and destroy it at 293 seconds later . The lost of 18.5 millions of dollars

Disaster 4

The sinking of the Hartford Coliseum

A software just calculate the weight most support the steel structure. steel structure of the roof collapsed under the weight of snow The lost of 90 millions of dollars

Disaster 5

Patriot Fails Soldiers (1991) A rounding error made the time is incorrectly calculated , causing the Patriot ignore the Scud missile attacker.

During the Gulf War , a system of US Patriot missiles in Saudi Arabia failed to intercept Iraqi Scud missile . The missile destroyed a US army barracks .

28 soldiers killed , 100 wounded.

CONCLUSION: In this life a few things are perfect, but we have mistakes , and the machines also because we made them. We most to check all the programs and software and learn about of our mistakes.

PROPOSAL: We most to check all the programs few times before using, because it can have bugs or mistakes, always every program can be better.

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